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ef141a0b SN |
1 | /***************************************************************************** |
2 | * | |
3 | * Author: Xilinx, Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | * | |
10 | * XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" | |
11 | * AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND | |
12 | * SOLUTIONS FOR XILINX DEVICES. BY PROVIDING THIS DESIGN, CODE, | |
13 | * OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, | |
14 | * APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION | |
15 | * THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT, | |
16 | * AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE | |
17 | * FOR YOUR IMPLEMENTATION. XILINX EXPRESSLY DISCLAIMS ANY | |
18 | * WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE | |
19 | * IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR | |
20 | * REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF | |
21 | * INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
22 | * FOR A PARTICULAR PURPOSE. | |
23 | * | |
24 | * Xilinx products are not intended for use in life support appliances, | |
25 | * devices, or systems. Use in such applications is expressly prohibited. | |
26 | * | |
27 | * (c) Copyright 2002 Xilinx Inc., Systems Engineering Group | |
28 | * (c) Copyright 2004 Xilinx Inc., Systems Engineering Group | |
29 | * (c) Copyright 2007-2008 Xilinx Inc. | |
30 | * All rights reserved. | |
31 | * | |
32 | * You should have received a copy of the GNU General Public License along | |
33 | * with this program; if not, write to the Free Software Foundation, Inc., | |
34 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
35 | * | |
36 | *****************************************************************************/ | |
37 | ||
38 | /* | |
ac646734 | 39 | * This is the code behind /dev/icap* -- it allows a user-space |
ef141a0b SN |
40 | * application to use the Xilinx ICAP subsystem. |
41 | * | |
42 | * The following operations are possible: | |
43 | * | |
44 | * open open the port and initialize for access. | |
45 | * release release port | |
46 | * write Write a bitstream to the configuration processor. | |
47 | * read Read a data stream from the configuration processor. | |
48 | * | |
49 | * After being opened, the port is initialized and accessed to avoid a | |
50 | * corrupted first read which may occur with some hardware. The port | |
51 | * is left in a desynched state, requiring that a synch sequence be | |
52 | * transmitted before any valid configuration data. A user will have | |
53 | * exclusive access to the device while it remains open, and the state | |
54 | * of the ICAP cannot be guaranteed after the device is closed. Note | |
55 | * that a complete reset of the core and the state of the ICAP cannot | |
56 | * be performed on many versions of the cores, hence users of this | |
57 | * device should avoid making inconsistent accesses to the device. In | |
58 | * particular, accessing the read interface, without first generating | |
59 | * a write containing a readback packet can leave the ICAP in an | |
60 | * inaccessible state. | |
61 | * | |
62 | * Note that in order to use the read interface, it is first necessary | |
63 | * to write a request packet to the write interface. i.e., it is not | |
64 | * possible to simply readback the bitstream (or any configuration | |
65 | * bits) from a device without specifically requesting them first. | |
66 | * The code to craft such packets is intended to be part of the | |
67 | * user-space application code that uses this device. The simplest | |
68 | * way to use this interface is simply: | |
69 | * | |
ac646734 | 70 | * cp foo.bit /dev/icap0 |
ef141a0b SN |
71 | * |
72 | * Note that unless foo.bit is an appropriately constructed partial | |
73 | * bitstream, this has a high likelyhood of overwriting the design | |
74 | * currently programmed in the FPGA. | |
75 | */ | |
76 | ||
ef141a0b SN |
77 | #include <linux/module.h> |
78 | #include <linux/kernel.h> | |
79 | #include <linux/types.h> | |
80 | #include <linux/ioport.h> | |
81 | #include <linux/interrupt.h> | |
82 | #include <linux/fcntl.h> | |
83 | #include <linux/init.h> | |
84 | #include <linux/poll.h> | |
85 | #include <linux/proc_fs.h> | |
f62f2fdd | 86 | #include <linux/mutex.h> |
f4943db1 | 87 | #include <linux/smp_lock.h> |
ef141a0b | 88 | #include <linux/sysctl.h> |
ef141a0b SN |
89 | #include <linux/fs.h> |
90 | #include <linux/cdev.h> | |
91 | #include <linux/platform_device.h> | |
92 | ||
93 | #include <asm/io.h> | |
94 | #include <asm/uaccess.h> | |
95 | #include <asm/system.h> | |
96 | ||
97 | #ifdef CONFIG_OF | |
98 | /* For open firmware. */ | |
99 | #include <linux/of_device.h> | |
100 | #include <linux/of_platform.h> | |
101 | #endif | |
102 | ||
103 | #include "xilinx_hwicap.h" | |
104 | #include "buffer_icap.h" | |
105 | #include "fifo_icap.h" | |
106 | ||
ac646734 | 107 | #define DRIVER_NAME "icap" |
ef141a0b SN |
108 | |
109 | #define HWICAP_REGS (0x10000) | |
110 | ||
ac646734 SN |
111 | #define XHWICAP_MAJOR 259 |
112 | #define XHWICAP_MINOR 0 | |
ef141a0b SN |
113 | #define HWICAP_DEVICES 1 |
114 | ||
ef141a0b SN |
115 | /* An array, which is set to true when the device is registered. */ |
116 | static bool probed_devices[HWICAP_DEVICES]; | |
f62f2fdd | 117 | static struct mutex icap_sem; |
ef141a0b SN |
118 | |
119 | static struct class *icap_class; | |
120 | ||
121 | #define UNIMPLEMENTED 0xFFFF | |
122 | ||
123 | static const struct config_registers v2_config_registers = { | |
124 | .CRC = 0, | |
125 | .FAR = 1, | |
126 | .FDRI = 2, | |
127 | .FDRO = 3, | |
128 | .CMD = 4, | |
129 | .CTL = 5, | |
130 | .MASK = 6, | |
131 | .STAT = 7, | |
132 | .LOUT = 8, | |
133 | .COR = 9, | |
134 | .MFWR = 10, | |
135 | .FLR = 11, | |
136 | .KEY = 12, | |
137 | .CBC = 13, | |
138 | .IDCODE = 14, | |
139 | .AXSS = UNIMPLEMENTED, | |
140 | .C0R_1 = UNIMPLEMENTED, | |
141 | .CSOB = UNIMPLEMENTED, | |
142 | .WBSTAR = UNIMPLEMENTED, | |
143 | .TIMER = UNIMPLEMENTED, | |
144 | .BOOTSTS = UNIMPLEMENTED, | |
145 | .CTL_1 = UNIMPLEMENTED, | |
146 | }; | |
147 | ||
148 | static const struct config_registers v4_config_registers = { | |
149 | .CRC = 0, | |
150 | .FAR = 1, | |
151 | .FDRI = 2, | |
152 | .FDRO = 3, | |
153 | .CMD = 4, | |
154 | .CTL = 5, | |
155 | .MASK = 6, | |
156 | .STAT = 7, | |
157 | .LOUT = 8, | |
158 | .COR = 9, | |
159 | .MFWR = 10, | |
160 | .FLR = UNIMPLEMENTED, | |
161 | .KEY = UNIMPLEMENTED, | |
162 | .CBC = 11, | |
163 | .IDCODE = 12, | |
164 | .AXSS = 13, | |
165 | .C0R_1 = UNIMPLEMENTED, | |
166 | .CSOB = UNIMPLEMENTED, | |
167 | .WBSTAR = UNIMPLEMENTED, | |
168 | .TIMER = UNIMPLEMENTED, | |
169 | .BOOTSTS = UNIMPLEMENTED, | |
170 | .CTL_1 = UNIMPLEMENTED, | |
171 | }; | |
172 | static const struct config_registers v5_config_registers = { | |
173 | .CRC = 0, | |
174 | .FAR = 1, | |
175 | .FDRI = 2, | |
176 | .FDRO = 3, | |
177 | .CMD = 4, | |
178 | .CTL = 5, | |
179 | .MASK = 6, | |
180 | .STAT = 7, | |
181 | .LOUT = 8, | |
182 | .COR = 9, | |
183 | .MFWR = 10, | |
184 | .FLR = UNIMPLEMENTED, | |
185 | .KEY = UNIMPLEMENTED, | |
186 | .CBC = 11, | |
187 | .IDCODE = 12, | |
188 | .AXSS = 13, | |
189 | .C0R_1 = 14, | |
190 | .CSOB = 15, | |
191 | .WBSTAR = 16, | |
192 | .TIMER = 17, | |
193 | .BOOTSTS = 18, | |
194 | .CTL_1 = 19, | |
195 | }; | |
196 | ||
197 | /** | |
f62f2fdd SN |
198 | * hwicap_command_desync - Send a DESYNC command to the ICAP port. |
199 | * @drvdata: a pointer to the drvdata. | |
ef141a0b SN |
200 | * |
201 | * This command desynchronizes the ICAP After this command, a | |
202 | * bitstream containing a NULL packet, followed by a SYNCH packet is | |
203 | * required before the ICAP will recognize commands. | |
204 | */ | |
f62f2fdd | 205 | static int hwicap_command_desync(struct hwicap_drvdata *drvdata) |
ef141a0b SN |
206 | { |
207 | u32 buffer[4]; | |
208 | u32 index = 0; | |
209 | ||
210 | /* | |
211 | * Create the data to be written to the ICAP. | |
212 | */ | |
213 | buffer[index++] = hwicap_type_1_write(drvdata->config_regs->CMD) | 1; | |
214 | buffer[index++] = XHI_CMD_DESYNCH; | |
215 | buffer[index++] = XHI_NOOP_PACKET; | |
216 | buffer[index++] = XHI_NOOP_PACKET; | |
217 | ||
218 | /* | |
219 | * Write the data to the FIFO and intiate the transfer of data present | |
220 | * in the FIFO to the ICAP device. | |
221 | */ | |
222 | return drvdata->config->set_configuration(drvdata, | |
223 | &buffer[0], index); | |
224 | } | |
225 | ||
226 | /** | |
f62f2fdd SN |
227 | * hwicap_get_configuration_register - Query a configuration register. |
228 | * @drvdata: a pointer to the drvdata. | |
229 | * @reg: a constant which represents the configuration | |
ef141a0b SN |
230 | * register value to be returned. |
231 | * Examples: XHI_IDCODE, XHI_FLR. | |
f62f2fdd | 232 | * @reg_data: returns the value of the register. |
ef141a0b SN |
233 | * |
234 | * Sends a query packet to the ICAP and then receives the response. | |
235 | * The icap is left in Synched state. | |
236 | */ | |
f62f2fdd SN |
237 | static int hwicap_get_configuration_register(struct hwicap_drvdata *drvdata, |
238 | u32 reg, u32 *reg_data) | |
ef141a0b SN |
239 | { |
240 | int status; | |
241 | u32 buffer[6]; | |
242 | u32 index = 0; | |
243 | ||
244 | /* | |
245 | * Create the data to be written to the ICAP. | |
246 | */ | |
247 | buffer[index++] = XHI_DUMMY_PACKET; | |
4c58f8fe | 248 | buffer[index++] = XHI_NOOP_PACKET; |
ef141a0b SN |
249 | buffer[index++] = XHI_SYNC_PACKET; |
250 | buffer[index++] = XHI_NOOP_PACKET; | |
4c58f8fe SN |
251 | buffer[index++] = XHI_NOOP_PACKET; |
252 | ||
253 | /* | |
254 | * Write the data to the FIFO and initiate the transfer of data present | |
255 | * in the FIFO to the ICAP device. | |
256 | */ | |
257 | status = drvdata->config->set_configuration(drvdata, | |
258 | &buffer[0], index); | |
259 | if (status) | |
260 | return status; | |
261 | ||
262 | /* If the syncword was not found, then we need to start over. */ | |
263 | status = drvdata->config->get_status(drvdata); | |
264 | if ((status & XHI_SR_DALIGN_MASK) != XHI_SR_DALIGN_MASK) | |
265 | return -EIO; | |
266 | ||
267 | index = 0; | |
ef141a0b SN |
268 | buffer[index++] = hwicap_type_1_read(reg) | 1; |
269 | buffer[index++] = XHI_NOOP_PACKET; | |
270 | buffer[index++] = XHI_NOOP_PACKET; | |
271 | ||
272 | /* | |
273 | * Write the data to the FIFO and intiate the transfer of data present | |
274 | * in the FIFO to the ICAP device. | |
275 | */ | |
276 | status = drvdata->config->set_configuration(drvdata, | |
277 | &buffer[0], index); | |
278 | if (status) | |
279 | return status; | |
280 | ||
281 | /* | |
282 | * Read the configuration register | |
283 | */ | |
f62f2fdd | 284 | status = drvdata->config->get_configuration(drvdata, reg_data, 1); |
ef141a0b SN |
285 | if (status) |
286 | return status; | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
f62f2fdd | 291 | static int hwicap_initialize_hwicap(struct hwicap_drvdata *drvdata) |
ef141a0b SN |
292 | { |
293 | int status; | |
294 | u32 idcode; | |
295 | ||
296 | dev_dbg(drvdata->dev, "initializing\n"); | |
297 | ||
298 | /* Abort any current transaction, to make sure we have the | |
299 | * ICAP in a good state. */ | |
300 | dev_dbg(drvdata->dev, "Reset...\n"); | |
301 | drvdata->config->reset(drvdata); | |
302 | ||
303 | dev_dbg(drvdata->dev, "Desync...\n"); | |
304 | status = hwicap_command_desync(drvdata); | |
305 | if (status) | |
306 | return status; | |
307 | ||
308 | /* Attempt to read the IDCODE from ICAP. This | |
309 | * may not be returned correctly, due to the design of the | |
310 | * hardware. | |
311 | */ | |
312 | dev_dbg(drvdata->dev, "Reading IDCODE...\n"); | |
313 | status = hwicap_get_configuration_register( | |
314 | drvdata, drvdata->config_regs->IDCODE, &idcode); | |
315 | dev_dbg(drvdata->dev, "IDCODE = %x\n", idcode); | |
316 | if (status) | |
317 | return status; | |
318 | ||
319 | dev_dbg(drvdata->dev, "Desync...\n"); | |
320 | status = hwicap_command_desync(drvdata); | |
321 | if (status) | |
322 | return status; | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | static ssize_t | |
f62f2fdd | 328 | hwicap_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
ef141a0b SN |
329 | { |
330 | struct hwicap_drvdata *drvdata = file->private_data; | |
331 | ssize_t bytes_to_read = 0; | |
332 | u32 *kbuf; | |
333 | u32 words; | |
334 | u32 bytes_remaining; | |
335 | int status; | |
336 | ||
f62f2fdd SN |
337 | status = mutex_lock_interruptible(&drvdata->sem); |
338 | if (status) | |
339 | return status; | |
ef141a0b SN |
340 | |
341 | if (drvdata->read_buffer_in_use) { | |
342 | /* If there are leftover bytes in the buffer, just */ | |
343 | /* return them and don't try to read more from the */ | |
344 | /* ICAP device. */ | |
345 | bytes_to_read = | |
346 | (count < drvdata->read_buffer_in_use) ? count : | |
347 | drvdata->read_buffer_in_use; | |
348 | ||
349 | /* Return the data currently in the read buffer. */ | |
350 | if (copy_to_user(buf, drvdata->read_buffer, bytes_to_read)) { | |
351 | status = -EFAULT; | |
352 | goto error; | |
353 | } | |
354 | drvdata->read_buffer_in_use -= bytes_to_read; | |
f62f2fdd SN |
355 | memmove(drvdata->read_buffer, |
356 | drvdata->read_buffer + bytes_to_read, | |
357 | 4 - bytes_to_read); | |
ef141a0b SN |
358 | } else { |
359 | /* Get new data from the ICAP, and return was was requested. */ | |
360 | kbuf = (u32 *) get_zeroed_page(GFP_KERNEL); | |
361 | if (!kbuf) { | |
362 | status = -ENOMEM; | |
363 | goto error; | |
364 | } | |
365 | ||
366 | /* The ICAP device is only able to read complete */ | |
367 | /* words. If a number of bytes that do not correspond */ | |
368 | /* to complete words is requested, then we read enough */ | |
369 | /* words to get the required number of bytes, and then */ | |
370 | /* save the remaining bytes for the next read. */ | |
371 | ||
372 | /* Determine the number of words to read, rounding up */ | |
373 | /* if necessary. */ | |
374 | words = ((count + 3) >> 2); | |
375 | bytes_to_read = words << 2; | |
376 | ||
377 | if (bytes_to_read > PAGE_SIZE) | |
378 | bytes_to_read = PAGE_SIZE; | |
379 | ||
380 | /* Ensure we only read a complete number of words. */ | |
381 | bytes_remaining = bytes_to_read & 3; | |
382 | bytes_to_read &= ~3; | |
383 | words = bytes_to_read >> 2; | |
384 | ||
385 | status = drvdata->config->get_configuration(drvdata, | |
386 | kbuf, words); | |
387 | ||
388 | /* If we didn't read correctly, then bail out. */ | |
389 | if (status) { | |
390 | free_page((unsigned long)kbuf); | |
391 | goto error; | |
392 | } | |
393 | ||
394 | /* If we fail to return the data to the user, then bail out. */ | |
395 | if (copy_to_user(buf, kbuf, bytes_to_read)) { | |
396 | free_page((unsigned long)kbuf); | |
397 | status = -EFAULT; | |
398 | goto error; | |
399 | } | |
f62f2fdd SN |
400 | memcpy(drvdata->read_buffer, |
401 | kbuf, | |
402 | bytes_remaining); | |
ef141a0b SN |
403 | drvdata->read_buffer_in_use = bytes_remaining; |
404 | free_page((unsigned long)kbuf); | |
405 | } | |
406 | status = bytes_to_read; | |
407 | error: | |
f62f2fdd | 408 | mutex_unlock(&drvdata->sem); |
ef141a0b SN |
409 | return status; |
410 | } | |
411 | ||
412 | static ssize_t | |
f62f2fdd | 413 | hwicap_write(struct file *file, const char __user *buf, |
ef141a0b SN |
414 | size_t count, loff_t *ppos) |
415 | { | |
416 | struct hwicap_drvdata *drvdata = file->private_data; | |
417 | ssize_t written = 0; | |
418 | ssize_t left = count; | |
419 | u32 *kbuf; | |
420 | ssize_t len; | |
421 | ssize_t status; | |
422 | ||
f62f2fdd SN |
423 | status = mutex_lock_interruptible(&drvdata->sem); |
424 | if (status) | |
425 | return status; | |
ef141a0b SN |
426 | |
427 | left += drvdata->write_buffer_in_use; | |
428 | ||
429 | /* Only write multiples of 4 bytes. */ | |
430 | if (left < 4) { | |
431 | status = 0; | |
432 | goto error; | |
433 | } | |
434 | ||
435 | kbuf = (u32 *) __get_free_page(GFP_KERNEL); | |
436 | if (!kbuf) { | |
437 | status = -ENOMEM; | |
438 | goto error; | |
439 | } | |
440 | ||
441 | while (left > 3) { | |
442 | /* only write multiples of 4 bytes, so there might */ | |
443 | /* be as many as 3 bytes left (at the end). */ | |
444 | len = left; | |
445 | ||
446 | if (len > PAGE_SIZE) | |
447 | len = PAGE_SIZE; | |
448 | len &= ~3; | |
449 | ||
450 | if (drvdata->write_buffer_in_use) { | |
451 | memcpy(kbuf, drvdata->write_buffer, | |
452 | drvdata->write_buffer_in_use); | |
453 | if (copy_from_user( | |
f62f2fdd | 454 | (((char *)kbuf) + drvdata->write_buffer_in_use), |
ef141a0b SN |
455 | buf + written, |
456 | len - (drvdata->write_buffer_in_use))) { | |
457 | free_page((unsigned long)kbuf); | |
458 | status = -EFAULT; | |
459 | goto error; | |
460 | } | |
461 | } else { | |
462 | if (copy_from_user(kbuf, buf + written, len)) { | |
463 | free_page((unsigned long)kbuf); | |
464 | status = -EFAULT; | |
465 | goto error; | |
466 | } | |
467 | } | |
468 | ||
469 | status = drvdata->config->set_configuration(drvdata, | |
470 | kbuf, len >> 2); | |
471 | ||
472 | if (status) { | |
473 | free_page((unsigned long)kbuf); | |
474 | status = -EFAULT; | |
475 | goto error; | |
476 | } | |
477 | if (drvdata->write_buffer_in_use) { | |
478 | len -= drvdata->write_buffer_in_use; | |
479 | left -= drvdata->write_buffer_in_use; | |
480 | drvdata->write_buffer_in_use = 0; | |
481 | } | |
482 | written += len; | |
483 | left -= len; | |
484 | } | |
485 | if ((left > 0) && (left < 4)) { | |
486 | if (!copy_from_user(drvdata->write_buffer, | |
487 | buf + written, left)) { | |
488 | drvdata->write_buffer_in_use = left; | |
489 | written += left; | |
490 | left = 0; | |
491 | } | |
492 | } | |
493 | ||
494 | free_page((unsigned long)kbuf); | |
495 | status = written; | |
496 | error: | |
f62f2fdd | 497 | mutex_unlock(&drvdata->sem); |
ef141a0b SN |
498 | return status; |
499 | } | |
500 | ||
501 | static int hwicap_open(struct inode *inode, struct file *file) | |
502 | { | |
503 | struct hwicap_drvdata *drvdata; | |
504 | int status; | |
505 | ||
f4943db1 | 506 | lock_kernel(); |
ef141a0b SN |
507 | drvdata = container_of(inode->i_cdev, struct hwicap_drvdata, cdev); |
508 | ||
f62f2fdd SN |
509 | status = mutex_lock_interruptible(&drvdata->sem); |
510 | if (status) | |
f4943db1 | 511 | goto out; |
ef141a0b SN |
512 | |
513 | if (drvdata->is_open) { | |
514 | status = -EBUSY; | |
515 | goto error; | |
516 | } | |
517 | ||
518 | status = hwicap_initialize_hwicap(drvdata); | |
519 | if (status) { | |
520 | dev_err(drvdata->dev, "Failed to open file"); | |
521 | goto error; | |
522 | } | |
523 | ||
524 | file->private_data = drvdata; | |
525 | drvdata->write_buffer_in_use = 0; | |
526 | drvdata->read_buffer_in_use = 0; | |
527 | drvdata->is_open = 1; | |
528 | ||
529 | error: | |
f62f2fdd | 530 | mutex_unlock(&drvdata->sem); |
f4943db1 JC |
531 | out: |
532 | unlock_kernel(); | |
ef141a0b SN |
533 | return status; |
534 | } | |
535 | ||
536 | static int hwicap_release(struct inode *inode, struct file *file) | |
537 | { | |
538 | struct hwicap_drvdata *drvdata = file->private_data; | |
539 | int i; | |
540 | int status = 0; | |
541 | ||
f62f2fdd | 542 | mutex_lock(&drvdata->sem); |
ef141a0b SN |
543 | |
544 | if (drvdata->write_buffer_in_use) { | |
545 | /* Flush write buffer. */ | |
546 | for (i = drvdata->write_buffer_in_use; i < 4; i++) | |
547 | drvdata->write_buffer[i] = 0; | |
548 | ||
549 | status = drvdata->config->set_configuration(drvdata, | |
550 | (u32 *) drvdata->write_buffer, 1); | |
551 | if (status) | |
552 | goto error; | |
553 | } | |
554 | ||
555 | status = hwicap_command_desync(drvdata); | |
556 | if (status) | |
557 | goto error; | |
558 | ||
559 | error: | |
560 | drvdata->is_open = 0; | |
f62f2fdd | 561 | mutex_unlock(&drvdata->sem); |
ef141a0b SN |
562 | return status; |
563 | } | |
564 | ||
565 | static struct file_operations hwicap_fops = { | |
566 | .owner = THIS_MODULE, | |
567 | .write = hwicap_write, | |
568 | .read = hwicap_read, | |
569 | .open = hwicap_open, | |
570 | .release = hwicap_release, | |
571 | }; | |
572 | ||
573 | static int __devinit hwicap_setup(struct device *dev, int id, | |
574 | const struct resource *regs_res, | |
575 | const struct hwicap_driver_config *config, | |
576 | const struct config_registers *config_regs) | |
577 | { | |
578 | dev_t devt; | |
579 | struct hwicap_drvdata *drvdata = NULL; | |
580 | int retval = 0; | |
581 | ||
582 | dev_info(dev, "Xilinx icap port driver\n"); | |
583 | ||
f62f2fdd SN |
584 | mutex_lock(&icap_sem); |
585 | ||
ef141a0b SN |
586 | if (id < 0) { |
587 | for (id = 0; id < HWICAP_DEVICES; id++) | |
588 | if (!probed_devices[id]) | |
589 | break; | |
590 | } | |
591 | if (id < 0 || id >= HWICAP_DEVICES) { | |
f62f2fdd | 592 | mutex_unlock(&icap_sem); |
ef141a0b SN |
593 | dev_err(dev, "%s%i too large\n", DRIVER_NAME, id); |
594 | return -EINVAL; | |
595 | } | |
596 | if (probed_devices[id]) { | |
f62f2fdd | 597 | mutex_unlock(&icap_sem); |
ef141a0b SN |
598 | dev_err(dev, "cannot assign to %s%i; it is already in use\n", |
599 | DRIVER_NAME, id); | |
600 | return -EBUSY; | |
601 | } | |
602 | ||
603 | probed_devices[id] = 1; | |
f62f2fdd | 604 | mutex_unlock(&icap_sem); |
ef141a0b | 605 | |
ac646734 | 606 | devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR + id); |
ef141a0b | 607 | |
f62f2fdd | 608 | drvdata = kzalloc(sizeof(struct hwicap_drvdata), GFP_KERNEL); |
ef141a0b SN |
609 | if (!drvdata) { |
610 | dev_err(dev, "Couldn't allocate device private record\n"); | |
f62f2fdd SN |
611 | retval = -ENOMEM; |
612 | goto failed0; | |
ef141a0b | 613 | } |
ef141a0b SN |
614 | dev_set_drvdata(dev, (void *)drvdata); |
615 | ||
616 | if (!regs_res) { | |
617 | dev_err(dev, "Couldn't get registers resource\n"); | |
618 | retval = -EFAULT; | |
619 | goto failed1; | |
620 | } | |
621 | ||
622 | drvdata->mem_start = regs_res->start; | |
623 | drvdata->mem_end = regs_res->end; | |
624 | drvdata->mem_size = regs_res->end - regs_res->start + 1; | |
625 | ||
626 | if (!request_mem_region(drvdata->mem_start, | |
627 | drvdata->mem_size, DRIVER_NAME)) { | |
b17b8181 KG |
628 | dev_err(dev, "Couldn't lock memory region at %Lx\n", |
629 | regs_res->start); | |
ef141a0b SN |
630 | retval = -EBUSY; |
631 | goto failed1; | |
632 | } | |
633 | ||
634 | drvdata->devt = devt; | |
635 | drvdata->dev = dev; | |
636 | drvdata->base_address = ioremap(drvdata->mem_start, drvdata->mem_size); | |
637 | if (!drvdata->base_address) { | |
638 | dev_err(dev, "ioremap() failed\n"); | |
639 | goto failed2; | |
640 | } | |
641 | ||
642 | drvdata->config = config; | |
643 | drvdata->config_regs = config_regs; | |
644 | ||
f62f2fdd | 645 | mutex_init(&drvdata->sem); |
ef141a0b SN |
646 | drvdata->is_open = 0; |
647 | ||
b17b8181 | 648 | dev_info(dev, "ioremap %lx to %p with size %Lx\n", |
ef141a0b SN |
649 | (unsigned long int)drvdata->mem_start, |
650 | drvdata->base_address, drvdata->mem_size); | |
651 | ||
652 | cdev_init(&drvdata->cdev, &hwicap_fops); | |
653 | drvdata->cdev.owner = THIS_MODULE; | |
654 | retval = cdev_add(&drvdata->cdev, devt, 1); | |
655 | if (retval) { | |
656 | dev_err(dev, "cdev_add() failed\n"); | |
657 | goto failed3; | |
658 | } | |
47aa5793 GKH |
659 | |
660 | device_create_drvdata(icap_class, dev, devt, NULL, | |
661 | "%s%d", DRIVER_NAME, id); | |
ef141a0b SN |
662 | return 0; /* success */ |
663 | ||
664 | failed3: | |
665 | iounmap(drvdata->base_address); | |
666 | ||
667 | failed2: | |
668 | release_mem_region(regs_res->start, drvdata->mem_size); | |
669 | ||
670 | failed1: | |
671 | kfree(drvdata); | |
672 | ||
f62f2fdd SN |
673 | failed0: |
674 | mutex_lock(&icap_sem); | |
675 | probed_devices[id] = 0; | |
676 | mutex_unlock(&icap_sem); | |
677 | ||
ef141a0b SN |
678 | return retval; |
679 | } | |
680 | ||
681 | static struct hwicap_driver_config buffer_icap_config = { | |
682 | .get_configuration = buffer_icap_get_configuration, | |
683 | .set_configuration = buffer_icap_set_configuration, | |
6b06fdba | 684 | .get_status = buffer_icap_get_status, |
ef141a0b SN |
685 | .reset = buffer_icap_reset, |
686 | }; | |
687 | ||
688 | static struct hwicap_driver_config fifo_icap_config = { | |
689 | .get_configuration = fifo_icap_get_configuration, | |
690 | .set_configuration = fifo_icap_set_configuration, | |
6b06fdba | 691 | .get_status = fifo_icap_get_status, |
ef141a0b SN |
692 | .reset = fifo_icap_reset, |
693 | }; | |
694 | ||
695 | static int __devexit hwicap_remove(struct device *dev) | |
696 | { | |
697 | struct hwicap_drvdata *drvdata; | |
698 | ||
699 | drvdata = (struct hwicap_drvdata *)dev_get_drvdata(dev); | |
700 | ||
701 | if (!drvdata) | |
702 | return 0; | |
703 | ||
f62f2fdd | 704 | device_destroy(icap_class, drvdata->devt); |
ef141a0b SN |
705 | cdev_del(&drvdata->cdev); |
706 | iounmap(drvdata->base_address); | |
707 | release_mem_region(drvdata->mem_start, drvdata->mem_size); | |
708 | kfree(drvdata); | |
709 | dev_set_drvdata(dev, NULL); | |
ef141a0b | 710 | |
f62f2fdd | 711 | mutex_lock(&icap_sem); |
ac646734 | 712 | probed_devices[MINOR(dev->devt)-XHWICAP_MINOR] = 0; |
f62f2fdd | 713 | mutex_unlock(&icap_sem); |
ef141a0b SN |
714 | return 0; /* success */ |
715 | } | |
716 | ||
717 | static int __devinit hwicap_drv_probe(struct platform_device *pdev) | |
718 | { | |
719 | struct resource *res; | |
720 | const struct config_registers *regs; | |
721 | const char *family; | |
722 | ||
723 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
724 | if (!res) | |
725 | return -ENODEV; | |
726 | ||
727 | /* It's most likely that we're using V4, if the family is not | |
728 | specified */ | |
729 | regs = &v4_config_registers; | |
730 | family = pdev->dev.platform_data; | |
731 | ||
732 | if (family) { | |
733 | if (!strcmp(family, "virtex2p")) { | |
734 | regs = &v2_config_registers; | |
735 | } else if (!strcmp(family, "virtex4")) { | |
736 | regs = &v4_config_registers; | |
737 | } else if (!strcmp(family, "virtex5")) { | |
738 | regs = &v5_config_registers; | |
739 | } | |
740 | } | |
741 | ||
742 | return hwicap_setup(&pdev->dev, pdev->id, res, | |
743 | &buffer_icap_config, regs); | |
744 | } | |
745 | ||
746 | static int __devexit hwicap_drv_remove(struct platform_device *pdev) | |
747 | { | |
748 | return hwicap_remove(&pdev->dev); | |
749 | } | |
750 | ||
751 | static struct platform_driver hwicap_platform_driver = { | |
752 | .probe = hwicap_drv_probe, | |
753 | .remove = hwicap_drv_remove, | |
754 | .driver = { | |
755 | .owner = THIS_MODULE, | |
756 | .name = DRIVER_NAME, | |
757 | }, | |
758 | }; | |
759 | ||
760 | /* --------------------------------------------------------------------- | |
761 | * OF bus binding | |
762 | */ | |
763 | ||
764 | #if defined(CONFIG_OF) | |
765 | static int __devinit | |
766 | hwicap_of_probe(struct of_device *op, const struct of_device_id *match) | |
767 | { | |
768 | struct resource res; | |
769 | const unsigned int *id; | |
770 | const char *family; | |
771 | int rc; | |
772 | const struct hwicap_driver_config *config = match->data; | |
773 | const struct config_registers *regs; | |
774 | ||
775 | dev_dbg(&op->dev, "hwicap_of_probe(%p, %p)\n", op, match); | |
776 | ||
777 | rc = of_address_to_resource(op->node, 0, &res); | |
778 | if (rc) { | |
779 | dev_err(&op->dev, "invalid address\n"); | |
780 | return rc; | |
781 | } | |
782 | ||
783 | id = of_get_property(op->node, "port-number", NULL); | |
784 | ||
785 | /* It's most likely that we're using V4, if the family is not | |
786 | specified */ | |
787 | regs = &v4_config_registers; | |
788 | family = of_get_property(op->node, "xlnx,family", NULL); | |
789 | ||
790 | if (family) { | |
791 | if (!strcmp(family, "virtex2p")) { | |
792 | regs = &v2_config_registers; | |
793 | } else if (!strcmp(family, "virtex4")) { | |
794 | regs = &v4_config_registers; | |
795 | } else if (!strcmp(family, "virtex5")) { | |
796 | regs = &v5_config_registers; | |
797 | } | |
798 | } | |
799 | return hwicap_setup(&op->dev, id ? *id : -1, &res, config, | |
800 | regs); | |
801 | } | |
802 | ||
803 | static int __devexit hwicap_of_remove(struct of_device *op) | |
804 | { | |
805 | return hwicap_remove(&op->dev); | |
806 | } | |
807 | ||
808 | /* Match table for of_platform binding */ | |
2fd53e02 | 809 | static const struct of_device_id __devinitconst hwicap_of_match[] = { |
ef141a0b SN |
810 | { .compatible = "xlnx,opb-hwicap-1.00.b", .data = &buffer_icap_config}, |
811 | { .compatible = "xlnx,xps-hwicap-1.00.a", .data = &fifo_icap_config}, | |
812 | {}, | |
813 | }; | |
814 | MODULE_DEVICE_TABLE(of, hwicap_of_match); | |
815 | ||
816 | static struct of_platform_driver hwicap_of_driver = { | |
817 | .owner = THIS_MODULE, | |
818 | .name = DRIVER_NAME, | |
819 | .match_table = hwicap_of_match, | |
820 | .probe = hwicap_of_probe, | |
821 | .remove = __devexit_p(hwicap_of_remove), | |
822 | .driver = { | |
823 | .name = DRIVER_NAME, | |
824 | }, | |
825 | }; | |
826 | ||
827 | /* Registration helpers to keep the number of #ifdefs to a minimum */ | |
f62f2fdd | 828 | static inline int __init hwicap_of_register(void) |
ef141a0b SN |
829 | { |
830 | pr_debug("hwicap: calling of_register_platform_driver()\n"); | |
831 | return of_register_platform_driver(&hwicap_of_driver); | |
832 | } | |
833 | ||
f62f2fdd | 834 | static inline void __exit hwicap_of_unregister(void) |
ef141a0b SN |
835 | { |
836 | of_unregister_platform_driver(&hwicap_of_driver); | |
837 | } | |
838 | #else /* CONFIG_OF */ | |
839 | /* CONFIG_OF not enabled; do nothing helpers */ | |
f62f2fdd SN |
840 | static inline int __init hwicap_of_register(void) { return 0; } |
841 | static inline void __exit hwicap_of_unregister(void) { } | |
ef141a0b SN |
842 | #endif /* CONFIG_OF */ |
843 | ||
f62f2fdd | 844 | static int __init hwicap_module_init(void) |
ef141a0b SN |
845 | { |
846 | dev_t devt; | |
847 | int retval; | |
848 | ||
849 | icap_class = class_create(THIS_MODULE, "xilinx_config"); | |
f62f2fdd | 850 | mutex_init(&icap_sem); |
ef141a0b | 851 | |
ac646734 SN |
852 | devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR); |
853 | retval = register_chrdev_region(devt, | |
854 | HWICAP_DEVICES, | |
855 | DRIVER_NAME); | |
856 | if (retval < 0) | |
857 | return retval; | |
ef141a0b SN |
858 | |
859 | retval = platform_driver_register(&hwicap_platform_driver); | |
860 | ||
861 | if (retval) | |
862 | goto failed1; | |
863 | ||
864 | retval = hwicap_of_register(); | |
865 | ||
866 | if (retval) | |
867 | goto failed2; | |
868 | ||
869 | return retval; | |
870 | ||
871 | failed2: | |
872 | platform_driver_unregister(&hwicap_platform_driver); | |
873 | ||
874 | failed1: | |
875 | unregister_chrdev_region(devt, HWICAP_DEVICES); | |
876 | ||
877 | return retval; | |
878 | } | |
879 | ||
f62f2fdd | 880 | static void __exit hwicap_module_cleanup(void) |
ef141a0b | 881 | { |
ac646734 | 882 | dev_t devt = MKDEV(XHWICAP_MAJOR, XHWICAP_MINOR); |
ef141a0b SN |
883 | |
884 | class_destroy(icap_class); | |
885 | ||
886 | platform_driver_unregister(&hwicap_platform_driver); | |
887 | ||
888 | hwicap_of_unregister(); | |
889 | ||
890 | unregister_chrdev_region(devt, HWICAP_DEVICES); | |
891 | } | |
892 | ||
893 | module_init(hwicap_module_init); | |
894 | module_exit(hwicap_module_cleanup); | |
895 | ||
896 | MODULE_AUTHOR("Xilinx, Inc; Xilinx Research Labs Group"); | |
897 | MODULE_DESCRIPTION("Xilinx ICAP Port Driver"); | |
898 | MODULE_LICENSE("GPL"); |